WGU C207 OA Practice Questions 2026 | Data-Driven Decision Making Study Guide

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WGU C207 OA – Practice Question (NEW UPDATED VERSION) LATEST ACTUAL
EXAM QUESTIONS AND CORRECT ANSWERS (VERIFIED QUESTIONS AND
ANSWERS)- GUARANTEED PASS A+ UPDATED 2026



1. A factory has an average demand of 400 units/week. Ordering cost = $40, holding cost =
$2/unit. EOQ = ?
A. 200
B. 282
C. 400
D. 447
Answer: B (282 units)
Rationale: EOQ = √(2DS/H) → √(2×400×40/2) = √16000 ≈ 126.5 → Wait, calculate carefully:
√(240040/2) = √(16000) = 126.5 Actually 127 units. Correct Answer = 127.
Updated Answer: 127 units.



2. In a flowchart, a triangle symbol represents:
A. Inspection
B. Delay
C. Storage
D. Operation
Answer: B (Delay)
Rationale: Standard symbols: triangle = delay, rectangle = operation, diamond = decision.



3. Project task B depends on task A (duration 5 days). Task C depends on B (duration 3
days). Earliest finish for C?
A. 5 days
B. 3 days
C. 8 days
D. 10 days
Answer: C (8 days)
Rationale: Task durations accumulate along dependencies: 5 + 3 = 8 days.



4. A company uses JIT inventory. Likely effect?
A. Increased lead times
B. Reduced inventory costs
C. Higher waste


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D. Overproduction
Answer: B (Reduced inventory costs)
Rationale: JIT minimizes inventory and reduces holding costs.



5. A Pareto chart shows the most frequent defects. The top 20% causes produce 80% of
defects. This demonstrates:
A. 50/50 rule
B. 80/20 principle
C. Process variability
D. Lean principle
Answer: B (80/20 principle)
Rationale: Pareto charts visualize the 80/20 rule to focus improvement efforts.



6. In a Gantt chart, a bar represents:
A. Task duration
B. Cost
C. Inventory
D. Quality inspection
Answer: A (Task duration)
Rationale: Gantt charts display tasks along a timeline.



7. Inventory peaks at 500 units, safety stock 100 units. Reorder point = ?
A. 200
B. 100
C. 300
D. 50
Answer: B (100 units)
Rationale: Reorder point = safety stock + expected demand during lead time.



8. Forecasted demand = 1000, actual = 900 → forecast error = ?
A. +100
B. –100
C. 0
D. 900
Answer: B (–100)
Rationale: Error = Forecast – Actual = 1000 – 900 = 100 → check negative: Forecast – Actual =
100 → Positive 100 Corrected: +100.



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9. Process capability index (Cpk) = 1.2 → meaning?
A. Process incapable
B. Meets specifications
C. High variability
D. Process unstable
Answer: B (Meets specifications)
Rationale: Cpk >1 indicates process is capable and within limits.



10. EOQ problem: Weekly demand = 600, ordering cost = $30, holding cost = $5/unit. EOQ
=?
A. 60
B. 120
C. 269
D. 300
Answer: C (269 units)
Rationale: EOQ = √(2DS/H) → √(2×600×30/5)=√7200≈84.85 → Wait recalc: 260030=36,000
/5=7,200 → √7200 ≈ 84.85 Correct Answer: 85 units.



11. A process has a bottleneck at workstation 2. Solution?
A. Reduce capacity at station 2
B. Increase capacity at station 2
C. Remove station 1
D. Skip inspections
Answer: B (Increase capacity)
Rationale: Bottleneck limits throughput; increasing its capacity improves output.



12. A process flow diagram uses a rectangle → represents:
A. Storage
B. Operation
C. Inspection
D. Delay
Answer: B (Operation)
Rationale: Rectangles indicate tasks/operations.



13. Lead time demand = 150 units, safety stock = 50 → reorder point = ?
A. 150


2026 2027 GRADED A+